text: var Cache = module.exports = function Cache() {
      this.storage = {};
  };
  
  Cache.prototype.has = function(key) {
      return this.storage.hasOwnProperty(key);
  };
  
  Cache.prototype.len = function() {
      return Object.keys(this.storage).length;
  };
  
  Cache.prototype.get = function(key) {
      return this.storage[key];
  };
  
  Cache.prototype.del = function(key) {
      delete this.storage[key];
  };
  
  Cache.prototype.store = function(key, value) {
      this.storage[key] = value;
  };
  